Erik Abba'
Laser Powder Bed Fusion of a New Inconel Superalloy Via In-Situ Alloying.
Rel. Abdollah Saboori, Giulio Marchese. Politecnico di Torino, Corso di laurea magistrale in Ingegneria Dei Materiali, 2021
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Abstract
Laser Powder Bed Fusion (L-PBF) technology was used to manufacture a new alloy by means of the new approach of in-situ alloying. Rather than use a pre-alloyed powder, the research involved the creation of a blend of Ti and Inconel 718 powders mixed in a 1:99 ratio (1%wt. Ti and 99%wt. Inconel 718). The aim of the study was first, to increase the mechanical properties of the new alloy compared to the reference Inconel 718 in its range of application temperatures (up to 600°C). Second, to study the feasibility of the situ-alloying as an alternative method to achieve desired alloy compositions, contrary to the more common use of pre-alloyed powders.
The former relied on the Ti tendency to enhance γ’ precipitation, while the latter exploited the metallographic characterization as a powerful means to study how differences in chemical composition, mass fraction, and size distribution of the powders affected the outcomes of the printing process
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